nrf9160 - can not set PSM

[SilasV]

Hi 

I am working on testing the PSM on my nrf9160 custom board using SLM 

After powering up and setting AT+CFUN=1, when I send the following AT commands:

AT+CPSMS=1,"","","10101010","00100001"
OK
AT+CPSMS?
+CPSMS: 1,,,"10101010","00100001"
OK
AT+CEREG?
+CEREG: 5,5,"590C","03BE4711",7,,,"11100000","11100000"
OK
AT%XMONITOR
%XMONITOR: 5,"Sprint","Sprint","310120","590C",7,25,"03BE4711",108,8665,24,34,"","11100000","11100000","01001001"
OK

It seems the network is not setting the requested PSM timer values - the returned values start with "111" - which means the timer is deactivated. 

Can anyone help me please?

Thanks

[Albrecht Markus Schellenberger]

Hello Silas,

I can confirm that you are not getting any Active-Time from the network operator and thus, no PSM neither.

My suspicion is that the network operator your SIM card is registered to might not support PSM, unfortunately. You have to check with them!

Regards,

Markus

[SilasV]

Thank you Markus for your prompt reply!

That may be the issue. 

So I am now thinking of approach of putting the nRF9160 to Sleep after use periodically.  I will run the tests in that direction and see how it goes. That way at least our devices will be independent of the PSM feature, since the devices are using with the roaming feature and not sure which network provider will be used at any given time. 

Would you please share any ideas on the above approach?

Thanks